// This file contains material supporting section 3.7 of the textbook:
// "Object Oriented Software Engineering" and is issued under the open-source
// license found at www.lloseng.com 

package client;
import ocsf.client.*;
import common.*;
import java.io.*;

/**
* This class overrides some of the methods defined in the abstract
* superclass in order to give more functionality to the client.
*
* @author Dr Timothy C. Lethbridge
* @author Dr Robert Lagani&egrave;
* @author Fran&ccedil;ois B&eacute;langer
* @version July 2000
*/
public class ChatClient extends AbstractClient
{
//Instance variables **********************************************

/**
 * The interface type variable.  It allows the implementation of 
 * the display method in the client.
 */
ChatIF clientUI; 


//Constructors ****************************************************

/**
 * Constructs an instance of the chat client.
 *
 * @param host The server to connect to.
 * @param port The port number to connect on.
 * @param clientUI The interface type variable.
 */

public ChatClient(String host, int port, ChatIF clientUI) 
  throws IOException 
{
  super(host, port); //Call the superclass constructor
  this.clientUI = clientUI;
  openConnection();
}


//Instance methods ************************************************
  
/**
 * This method handles all data that comes in from the server.
 *
 * @param msg The message from the server.
 */
public void handleMessageFromServer(Object msg) 
{
  clientUI.display(msg.toString());
}

/**
 * This method handles all data coming from the UI            
 *
 * @param message The message from the UI.    
 */
public void handleMessageFromClientUI(String message)
{
  try
  {
    sendToServer(message);
  }
  catch(IOException e)
  {
    clientUI.display
      ("Could not send message to server.  Terminating client.");
    quit();
  }
}

/**
 * This method terminates the client.
 */
public void quit()
{
  try
  {
    closeConnection();
  }
  catch(IOException e) {}
  System.exit(0);
}
}
//End of ChatClient class
